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DRV2604L: 0x1A_[1:0] BEMF_GAIN setting

Yusuke Mukuno
Expert 7395 points
Part Number: DRV2604L

Hi Expert,

They found the difference output waveform by BEMF_GAIN setting.

Could you please let me know the reason of difference?

at BEMF_GAIN=0x03

at  BEMF_GAIN=0x02

Thanks

Muk

  • 0
    TI__Genius 13610 points

    Hello Muk,

    Well with the higher gain BEMF_GAIN value on top the closed algorithm is reading in actuator acceleration as larger than it should be causing it to overcorrect which then leads to next reading seeing too big of a drop in acceleration and tries to correct again and cycles through that loop trying to stabilize but never reaches it because that back-EMF amplification is too large for it to do so.

    That lower picture with lower gain setting allows it to stabilize and output a consistent waveform.

    Best Regards,

    Carson

    Low Power Audio Applications